Radeon HD 6750 vs Radeon HD 7870 XT

Intro

Compare those specs to the Radeon HD 7870 XT, which makes use of a 28 nm design. AMD has clocked the core frequency at 925 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this specific model. It features 1536 SPUs as well as 96 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
Radeon HD 7870 XT		185 Watts
	Difference: 99 Watts (115%)

Memory Bandwidth

In theory, the Radeon HD 7870 XT will be 200% faster than the Radeon HD 6750 overall, due to its higher bandwidth. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 128000 (200%)

Texel Rate

The Radeon HD 7870 XT will be a lot (about 240%) faster with regards to texture filtering than the Radeon HD 6750. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 62700 (240%)

Pixel Rate

The Radeon HD 7870 XT should be quite a bit (about 155%) more effective at AA than the Radeon HD 6750, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 18000 (155%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.